Attachment for carburetors



T l 422,87 1; Patented July 18, 1922;

L. F. LIESER. ATTACHMENT FOR CARBURETORS. APPLICATION FILED JUNE 4, 1919.

A TTOR/VEYS LEO r. LIESER, or SIDNEY, IOWA.

ATTACHMENT FOR CARBU'RETGRS'.

Specification of Letters Patent.

iaaaeai.

Patented July i8, 1922.

Application filed .Tune 4, 1919. Serial No. 301,679.

T 0 all whom may concern:

Be it known that I, Lao F. Lrnsnn, a citizen of the United States, and a resident of Sidney, in the county of Fremont and State of Iowa, have invented certain new and useful Improvements in Attachments for Can buretors, of which the following is a specification.

My present invention relates generally to carburetors and more particularly to mixture controlling devices, my object being the provision of simple, inexpensive means whereby to allow for a rich mixture for starting purposes when the parts are cold. and to automatically taper off to a comparatively lean mixture when the parts become warmed up after starting.

It is a well known fact that considerable difficulty is experienced in adjusting the present carburetors to permit of ready starting and at the same time provide for economical operation after starting. in fact, with most carburetors, it is more than merely difiicult, and it is to overcome these disadvantages at which my invention aims in the production of an automatic fuel valve which will be simple, inexpensive, capable of ready installation, and quick, easy adjustment.

In the accompanying drawing, illustrating my present invention, and forming a part of this specification, I

Figure 1 is a side view illustrating my invention operatively connected to a fuel valve,

Figure 2 is a top plan view thereof, and,

Figure 3 is a sectional side view illustrating the same in connection with a carburetor.

In connection with carburetors of which a conventional illustration appears in Figure 3, fuel valves are generally in the form of a needle valve 10 which threads, for instance, as seen at 11, through a support in the form of a cap 12 and has an outer adjusting head 13. Obviously such valves require rotation of their stems to shift the same in respect to their seats and my invention for purposes of adaptation to such valves, provides a controlling arm 14 which has one end in the form of a clamp 15 acting, by means of a clamping bolt 16, to adjustably, securely engage the external por tion of the valve stem 17. The outer end of this arm preferably has an opening 18 for a purpose which will be presently described. l

vSecured to the valve support or cap 12, by a clamping nut 19 and the like, is an offset and angularly bent end 20 of an arcuate thermostat 21, which is disposed around the needle valve stem 17 and the opposite free end of which is spaced from its secured end and has an angular recess forming a lug 22 extended into the controlling arm opening 18.

The thermostat 21 is preferably of laminated construction, formed, for instance, by an inner layer of steel and an outer layer of brass, so that the relatively greater expansion or" the latter under heat will cause a buckling and thus shift the free end of the thermostat inwardly and toward the an chored end thereof.

In utilizing my invention, therefore, the fuel valve is first set for the necessary rich starting mixture with the parts cold, and the thermostat is anchored in place and its controlling arm connected to the valve stem, so that while thus allowing for the rich and desirable starting mixture, the thermostat will act when the parts become warm after starting by virtue of the relatively greater expansion of the outer layer, which will cause the free end of the thermostat to move inwardly and toward its anchored end; and the valve stem will be rotated in this way through swinging movement of arm 14' to shift the valve 10 toward its seat.

Referring now to Figure 3, I have shown a carburetor wherein the valve seat 23 is within a horizontal wall 2d between the fuel chamber 25, wherein the fuel level is governed by a float 26, and the mixing chamber 27 to which air is admitted through an air'valve 28. This type of carburetor lends itself particularly to the convenient, quick installation and adjustment of my inven tion and provides for its effective operation, but in view of the many other types to which it may be efiiciently adapted l do not wish the conventional illustration to be taken in a limiting sense'except so far as the terms of the claims direct.

I claim 1. A carburetor having a fuel valve provided with an exteriorly projecting stem, and also having a support in which the stem is threaded whereby to reciprocate the valve upon rotation of the stem, a thermostat an chored at one end upon the carburetor and lying Wholly Within the limits of the carburetor and its valve stem and around the latter, said thermostat having a recess at its free end and a lug projecting into the recess, and a svvingalole arm clamped at its inner end in connection Withthe valve stem and having an aperture at its outer end receiving the lug of the thermostat.

2. A'carburetor having a fuel valve provided with a stem a cap piece for the carburetor in which the stem has a threaded connection whereby to reciprocate the stem LEO F. LIESER. 

